Pitfalls in the use and interpretation of TGA and MIP techniques for Ca-leached cementitious materials

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Pitfalls in the use and interpretation of TGA and MIP techniques for Ca-leached cementitious materials. / Phung, Quoc Tri; Maes, Norbert; Seetharam, Suresh.

In: Materials and Design, Vol. 182, 108041, 15.11.2019, p. 1-12.

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Phung, Quoc Tri; Maes, Norbert; Seetharam, Suresh / Pitfalls in the use and interpretation of TGA and MIP techniques for Ca-leached cementitious materials.

In: Materials and Design, Vol. 182, 108041, 15.11.2019, p. 1-12.

Research output: Contribution to journalArticle

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@article{5ca465be6cfa474a8ce89cf833eeebce,
title = "Pitfalls in the use and interpretation of TGA and MIP techniques for Ca-leached cementitious materials",
keywords = "Microstructure, Mineralogy, Mercury intrusion porosimetry, Thermal gravimetric analysis, Micromechanics, Cement paste",
author = "Phung, {Quoc Tri} and Norbert Maes and Suresh Seetharam",
note = "Score=10",
year = "2019",
month = "11",
doi = "10.1016/j.matdes.2019.108041",
volume = "182",
pages = "1--12",
journal = "Materials and Design",
issn = "0261-3069",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Pitfalls in the use and interpretation of TGA and MIP techniques for Ca-leached cementitious materials

AU - Phung,Quoc Tri

AU - Maes,Norbert

AU - Seetharam,Suresh

N1 - Score=10

PY - 2019/11/15

Y1 - 2019/11/15

N2 - The study of Ca-leaching of cement-basedmaterials has necessitated the use of accelerated leaching experiments because of extremely slow leaching kinetics. The microstructural and mineralogical changes resulting from such leaching experiments are typically studied using Mercury intrusion porosimetry (MIP) and Thermal gravimetric analysis (TGA), respectively. This paper closely examines the pitfalls associated with applying these techniques to study the behaviour of leached materials. In this context, accelerated leaching experiments of cement paste samples with twowater/cement ratios (0.325 and 0.425) are used as the basis. MIP and TGA results for both leached and intact paste samples are presented in termsof pore size distribution and phase fractions (portlandite, calcium carbonate and C-S-H), respectively. Results suggest that specifically for leachedmaterials, a theoretical correction over and above that suggested by MIP manufacturer is needed to correctly interpret MIP data for original samples. However, TGA should not be used to study the leached materials subjected to accelerated leaching using ammonium nitrate solution.

AB - The study of Ca-leaching of cement-basedmaterials has necessitated the use of accelerated leaching experiments because of extremely slow leaching kinetics. The microstructural and mineralogical changes resulting from such leaching experiments are typically studied using Mercury intrusion porosimetry (MIP) and Thermal gravimetric analysis (TGA), respectively. This paper closely examines the pitfalls associated with applying these techniques to study the behaviour of leached materials. In this context, accelerated leaching experiments of cement paste samples with twowater/cement ratios (0.325 and 0.425) are used as the basis. MIP and TGA results for both leached and intact paste samples are presented in termsof pore size distribution and phase fractions (portlandite, calcium carbonate and C-S-H), respectively. Results suggest that specifically for leachedmaterials, a theoretical correction over and above that suggested by MIP manufacturer is needed to correctly interpret MIP data for original samples. However, TGA should not be used to study the leached materials subjected to accelerated leaching using ammonium nitrate solution.

KW - Microstructure

KW - Mineralogy

KW - Mercury intrusion porosimetry

KW - Thermal gravimetric analysis

KW - Micromechanics

KW - Cement paste

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/34912219

U2 - 10.1016/j.matdes.2019.108041

DO - 10.1016/j.matdes.2019.108041

M3 - Article

VL - 182

SP - 1

EP - 12

JO - Materials and Design

T2 - Materials and Design

JF - Materials and Design

SN - 0261-3069

M1 - 108041

ER -

ID: 5456223